Microsoft nearly doubled its losses from the Xbox video game console in the December quarter, according to a filing with the Securities and Exchange Commission. Meanwhile, the unit that makes Microsoft's Office software closed in on Windows as being the company's most profitable. Microsoft's Home and Entertainment segment, which includes the Xbox, PC games and the company's TV products, posted an operating loss of $348 million in the quarter on revenue of $1.28 billion. A year earlier it had a loss of $180 million on revenue of $833 million. The company loses money on each Xbox it sells, with some analysts pegging the shortfall at more than $100 per $199 console, meaning that strong sales for the platform actually increase its losses.